| Buffalo to Oerlinghausen | 3,885.62 mi (6,253.30 km) |
| Buffalo to Oestrich-Winkel | 3,925.44 mi (6,317.39 km) |
| Buffalo to Offenburg | 3,974.98 mi (6,397.11 km) |
| Buffalo to Oftersheim | 3,969.57 mi (6,388.40 km) |
| Buffalo to Ohrdruf | 4,001.76 mi (6,440.21 km) |
| Buffalo to Ohringen | 4,011.18 mi (6,455.36 km) |
| Buffalo to Olbernhau | 4,104.98 mi (6,606.33 km) |
| Buffalo to Olching | 4,117.80 mi (6,626.96 km) |
| Buffalo to Oldenburg | 3,830.82 mi (6,165.11 km) |
| Buffalo to Oldenburg in Holstein | 3,890.07 mi (6,260.46 km) |
| Buffalo to Olfen | 3,845.37 mi (6,188.52 km) |
| Buffalo to Olpe | 3,885.24 mi (6,252.70 km) |
| Buffalo to Olsberg | 3,899.01 mi (6,274.84 km) |
| Buffalo to Oranienburg | 4,026.75 mi (6,480.43 km) |
| Buffalo to Ortenberg | 3,954.15 mi (6,363.59 km) |
